Mabel and Herbert have been married for over twenty years, and their marriage has grown rather stale. Mabel is very attentive to him, but Herbert feels he is being governed each and every day. He just isn't happy, and he's a lonely as a man can be. Stepping out for a break in the park, he meets a young lady called Alice, and they embark upon an affair - until Mabel hires a private detective and puts an end to it...